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| | xorshammer.com
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| | There are many functions from $latex \mathbb{N}$ to $latex \mathbb{N}$ that cannot be computed by any algorithm or computer program. For example, a famous one is the halting problem, defined by $latex f(n) = 0$ if the $latex n$th Turing machine halts and $latex f(n) = 1$ if the $latex n$th Turing machine does not...
| | math.andrej.com
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| | scottaaronson.blog
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| | (Thanks to Amit Sahai for spurring me to write this post!) The Background We all remember Gödel's First Incompleteness Theorem from kindergarten. This is the thing that, given a formal system F, constructs a sentence G(F) that's a mathematical encoding of "This sentence is not provable in F." If F proves G(F), then F proves...
| | profmattstrassler.com
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| Einstein's gravity is widely seen as the most beautiful theory in all of physics. But dark energy, quantum physics, and string theory all raise questions.